/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.edu.thu.laud.utils.serde;

import java.nio.ByteBuffer;

import org.datanucleus.store.types.ObjectStringConverter;

/**
 * Encapsulates both a long converter and a DN long converter in the same
 * instance
 * 
 * @author zhuoan
 * 
 */
public class ObjectStringWrapperConverter implements IConverter {

	private ObjectStringConverter dnStringConverter;
	private IConverter stringConverter;

	public ObjectStringWrapperConverter(ObjectStringConverter dnLongConverter,
			IConverter stringConverter) {
		this.dnStringConverter = dnLongConverter;
		this.stringConverter = stringConverter;
	}

	@Override
	public String getComparatorType() {
		return "UTF8Type";
	}

	@Override
	public Object getObject(ByteBuffer buffer, ConverterContext context) {
		if (buffer == null) {
			return null;
		}
		return dnStringConverter.toObject((String) stringConverter
				.getObject(buffer, context));
	}

	@Override
	public ByteBuffer writeBytes(Object value, ByteBuffer buffer, ConverterContext context) {
		String stringVal = dnStringConverter.toString(value);

		return stringConverter.writeBytes(stringVal, buffer, context);
	}


}
